Mongkol, S., and D. Taworn. “Comparisons of Respiratory Muscle Strength and Chest Expansions Between Obese Class I and Normal Weight Females”. Journal of Associated Medical Sciences, vol. 50, no. 3, Sept. 2017, p. 378, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/88665.